8131012221 has 16 divisors (see below), whose sum is σ = 10941134400. Its totient is φ = 5371008000.

The previous prime is 8131012193. The next prime is 8131012231. The reversal of 8131012221 is 1222101318.

It is not a de Polignac number, because 8131012221 - 2⁵ = 8131012189 is a prime.

It is a super-2 number, since 2×8131012221² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8131012231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117355 + ... + 173303.

It is an arithmetic number, because the mean of its divisors is an integer number (683820900).

Almost surely, 2^8131012221 is an apocalyptic number.

It is an amenable number.

8131012221 is a deficient number, since it is larger than the sum of its proper divisors (2810122179).

8131012221 is a wasteful number, since it uses less digits than its factorization.

8131012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56396.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 8131012221 is about 90172.1255211387. The cubic root of 8131012221 is about 2010.8586235360.

Adding to 8131012221 its reverse (1222101318), we get a palindrome (9353113539).

The spelling of 8131012221 in words is "eight billion, one hundred thirty-one million, twelve thousand, two hundred twenty-one".